18424842493 has 2 divisors, whose sum is σ = 18424842494. Its totient is φ = 18424842492.

The previous prime is 18424842481. The next prime is 18424842509. The reversal of 18424842493 is 39424842481.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18163761529 + 261080964 = 134773^2 + 16158^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18424842493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18424842473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9212421246 + 9212421247.

It is an arithmetic number, because the mean of its divisors is an integer number (9212421247).

Almost surely, 2^18424842493 is an apocalyptic number.

It is an amenable number.

18424842493 is a deficient number, since it is larger than the sum of its proper divisors (1).

18424842493 is an equidigital number, since it uses as much as digits as its factorization.

18424842493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1769472, while the sum is 49.

The spelling of 18424842493 in words is "eighteen billion, four hundred twenty-four million, eight hundred forty-two thousand, four hundred ninety-three".